The NY Times recently published an article “What Causes Girls to Enter Puberty Early?” I immediately read the article, especially because I have a 7 year old daughter, and puberty can start as early as 7 years old for some girls. Basically, they sited that stress, obesity and environmental toxins were prime suspects. All of these factors affect the endocrine system causing the body to create too much estrogen, which can lead to estrogen positive breast cancer. The article also sites that early puberty can lead to not only breast cancer, but depression, eating disorders, and substance abuse. Studies show that mice with cancer under stress are more likely to have metastatic cancer, another reason to manage stress.